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build, hack, tweak, share, discover,-
Written By: Graffiti Research Lab
20 cents each from HB Electronic Components (http://hebeiltd.com.cn).
One roll will make many throwies.
25 cents each from CheapBatteries.com.
Disc magnet (1)
25 count for about $15 from Amazing Magnets (http://amazingmagnets.com).
Weather-resistant alternative to tape. Available from Newark InOne (http://newark.com).
Make and toss a bunch of these inexpensive little lights to add color to any ferromagnetic
surface in your neighborhood.
© Make Projects www.makeprojects.com Page 1 of 3
Step 1 — Test the LED.
• Pinch the LED's leads to the
battery terminals, with the longer
lead (the anode) touching the
positive terminal (+) of the battery,
and the shorter lead (the cathode)
touching negative (-).
• Confirm that the LED lights up.
• Tape the LED leads to the battery
by cutting off a 7" piece of
strapping tape and wrapping it once
around both sides of the battery.
Keep the tape very tight as you
wrap. The LED should not flicker.
• Place the magnet on the positive
terminal of the battery, and
continue to wrap the tape tightly
until it's all done. The magnet
should hold firmly to the battery.
• The battery's positive
contact surface extends
around the sides of the battery.
Don't let the LED's cathode touch
the positive terminal, or you'll short
• That's it — you're ready to throw
(or make a few dozen more).
Throw it up high and in quantity to
impress your friends and city
© Make Projects
Page 2 of 3
• A throwie will shine for about 1-2
weeks, depending on the weather
and the LED color. To get one off a
ferro-magnetic surface, don't pull it,
or it may come apart. Instead,
apply a lateral force to the magnet
base, and slide it off the surface
while lifting it with a fingernail or
• Throwies naturally chain together in
your pocket, making multi-
segmented throwie bugs, which will
also stick to metal surfaces if they
aren't too long.
This project originally appeared in MAKE Volume 6 . page 116.
This document was last generated on 201 2-1 1 -01 09:53:1 4 AM.
© Make Projects
Page 3 of 3